315/35 r17 VS 325/45 r17

06GTMustang89 · March 18th, 2008, 05:07 PM

Ok guys now im on the drag radial debate haha and the size difference here. My last trap speed was 105mph but ive added 10 more rwhp with the JLT over the K&N and im adding BBK LT headers which should net like 14rwhp. So my trap speed will be higher im guessing.

Stock 235/50 r18's = 27.3 inches in dia.

M/T 315/35 r 17's = 25.7 inches in dia.

M&H 325/45 r 17's = 28.5 inches in dia.

Stock "effective" gear ratio is 3.55

M/T's bring it to 3.77
M&H bring it to 3.40

what im getting at is i hit 3rd gear at about 6100rpm at the finish line all stock at 105mph

with the M/T's 3rd gear ends at 97mph so ill have to shift into 4th

with the M&H's 3rd gear ends at 108mph so most likely i won't have to shift into 4th....

question is which tire should i go with and how stupid would a the 315/35's look since they are smaller then my stockers?

kenneth · March 18th, 2008, 05:25 PM

I'm going with the M&H's for my tires this week, I tried the BFG drag radials that are 26" tall that aren't worth a crap.

Grabber523 · March 18th, 2008, 05:38 PM

The shorter tires do look kinda silly...and it changes your speed -2 mph from indicated. I would go with the taller tires. I run the shorter ones but I'm at the top of 4th at 1/4, so it really doesn't affect me much (I think it makes my final drive around 3.90 ish?). That shift into 4th will hurt you more than help, and if you drive the car well you definitely don't want to bounce off the rev limiter before you cross the line. My $0.02

06GTMustang89 · March 18th, 2008, 06:13 PM

yeah thats what i was thinking

March 18th, 2008, 05:07 PM	#1
06GTMustang89 MM Fanatic 2006 Mustang GT 6spd 12.61@109mph Join Date: Sep 2007 Location: North Carolina Posts: 3,178 iTrader: 0 reviews	315/35 r17 VS 325/45 r17 Ok guys now im on the drag radial debate haha and the size difference here. My last trap speed was 105mph but ive added 10 more rwhp with the JLT over the K&N and im adding BBK LT headers which should net like 14rwhp. So my trap speed will be higher im guessing. Stock 235/50 r18's = 27.3 inches in dia. M/T 315/35 r 17's = 25.7 inches in dia. M&H 325/45 r 17's = 28.5 inches in dia. Stock "effective" gear ratio is 3.55 M/T's bring it to 3.77 M&H bring it to 3.40 what im getting at is i hit 3rd gear at about 6100rpm at the finish line all stock at 105mph with the M/T's 3rd gear ends at 97mph so ill have to shift into 4th with the M&H's 3rd gear ends at 108mph so most likely i won't have to shift into 4th.... question is which tire should i go with and how stupid would a the 315/35's look since they are smaller then my stockers? __________________ JLT CAI: KOOKS LT's: Comp NSR II's: 4.56's: TR6060: Steeda LCA, UCA: QA1's: Roush rear springs...see garage for more.

March 18th, 2008, 05:25 PM	#2
kenneth Hardcore Enthusiast 2006 Mustang GT 11.45@123.61 Join Date: Nov 2007 Location: Cut Off, LA. Posts: 1,468 iTrader: 2 reviews	I'm going with the M&H's for my tires this week, I tried the BFG drag radials that are 26" tall that aren't worth a crap. __________________ Stock for now.

March 18th, 2008, 05:38 PM	#3
Grabber523 Your Mom's Favorite 2007 Mustang GT Eats Chevys, Shits Imports... Join Date: Mar 2007 Location: Scott AFB, Illinois Posts: 2,490 iTrader: 0 reviews	The shorter tires do look kinda silly...and it changes your speed -2 mph from indicated. I would go with the taller tires. I run the shorter ones but I'm at the top of 4th at 1/4, so it really doesn't affect me much (I think it makes my final drive around 3.90 ish?). That shift into 4th will hurt you more than help, and if you drive the car well you definitely don't want to bounce off the rev limiter before you cross the line. My $0.02 __________________ http://www.moddedmustangs.com/forums...p-vote-me.html TEAM RICER GT CREW MEMBER (11 SECOND RIDE WITH A 12 SECOND DRIVER) MEMBERS AGAINST MEMBERS AGAINST STUFF CREW FOUNDER TRUNK MONKEY CREW FOUNDER

March 18th, 2008, 06:13 PM	#4
06GTMustang89 MM Fanatic 2006 Mustang GT 6spd 12.61@109mph Join Date: Sep 2007 Location: North Carolina Posts: 3,178 iTrader: 0 reviews	yeah thats what i was thinking __________________ JLT CAI: KOOKS LT's: Comp NSR II's: 4.56's: TR6060: Steeda LCA, UCA: QA1's: Roush rear springs...see garage for more.

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